High-performance finite-time adaptive control strategy for three-level T-type converters.

Area of Science:

• Electrical Engineering
• Power Electronics
• Control Systems

Background:

• Three-level T-type converters are crucial interfaces connecting distributed energy resources (DERs) to the power grid.
• Efficient converter operation relies on robust control strategies that enhance dynamic performance and system stability.
• Existing control methods may face challenges in handling disturbances and achieving precise current tracking.

Purpose of the Study:

• To introduce an improved finite-time control (IFTC) strategy for three-level T-type converters.
• To enhance the dynamic performance and anti-disturbance capabilities of these converters.
• To ensure efficient and reliable interaction between DERs and the public grid.

Main Methods:

• Implementation of a dual-loop control structure for dc-link voltage and grid current regulation.
• Utilization of a finite-time adaptive controller in the voltage loop to manage load disturbances without current sensors.
• Integration of finite-time controllers and a command filter in the current tracking loop to achieve fast and accurate current control, avoiding derivative calculations.

Main Results:

• The proposed IFTC strategy demonstrates superior dynamic performance compared to conventional methods.
• The controller exhibits strong robustness against external disturbances, ensuring stable converter operation.
• Experimental validation confirms the effectiveness of the IFTC strategy in practical applications.

Conclusions:

• The IFTC strategy offers a promising solution for enhancing the performance of three-level T-type converters.
• This control approach facilitates more efficient and reliable integration of distributed energy resources into the power grid.
• The sensorless voltage control and precise current tracking capabilities make the IFTC strategy highly applicable.